import fetch from "dva/fetch";
import { notification } from "antd";
import { routerRedux } from "dva/router";
import store from "../index";
import { stringify } from "qs";

const codeMessage = {
  200: "服务器成功返回请求的数据",
  201: "新建或修改数据成功。",
  202: "一个请求已经进入后台排队（异步任务）",
  204: "删除数据成功。",
  400: "发出的请求有错误，服务器没有进行新建或修改数据,的操作。",
  401: "用户没有权限（令牌、用户名、密码错误）。",
  403: "用户得到授权，但是访问是被禁止的。",
  404: "发出的请求针对的是不存在的记录，服务器没有进行操作",
  406: "请求的格式不可得。",
  410: "请求的资源被永久删除，且不会再得到的。",
  422: "当创建一个对象时，发生一个验证错误。",
  500: "服务器发生错误，请检查服务器",
  502: "网关错误",
  503: "服务不可用，服务器暂时过载或维护",
  504: "网关超时"
};
function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response.json();
  }
  const errortext = codeMessage[response.status] || response.statusText;
  notification.error({
    message: `请求错误 ${response.status}: ${response.url}`,
    description: errortext
  });
  const error = new Error(errortext);
  error.name = response.status;
  error.response = response;
  throw error;
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, options, 成功, 失败) {
  const 服务器接口地址 = store.getState().global.服务器接口地址;
  url = "http://" + 服务器接口地址 + "/接口/" + url;
  if (!options) {
    options = {};
  }
  options.Token = localStorage.Token;

  const defaultOptions = {
    credentials: "include"
  };
  const newOptions = { ...defaultOptions, ...options };
  if (newOptions.method === "POST" || newOptions.method === "PUT") {
    newOptions.headers = {
      Accept: "application/json",
      "Content-Type": "application/json; charset=utf-8",
      ...newOptions.headers
    };
    newOptions.body = JSON.stringify(newOptions.body);
  } else {
    url = url + `?${stringify(options)}`;
  }

  return fetch(url, newOptions)
    .then(checkStatus)
    .then(请求结果 => {
      const { dispatch } = store;
      if (请求结果.code == -1) {
        dispatch(routerRedux.push("/user/login"));
        return;
      }
      if (请求结果.code == 0 && 成功) {
        成功(请求结果.data, 请求结果.total);
      }
      if (请求结果.code != 0 && 失败) {
        失败(请求结果.code, 请求结果.data);
      }
      return 请求结果;
    })
    .catch(e => {
      const { dispatch } = store;
      if (e.name === 401) {
        dispatch({
          type: "login/logout"
        });
        return;
      }
      if (e.name === 403) {
        dispatch(routerRedux.push("/exception/403"));
        return;
      }
      if (e.name <= 504 && e.name >= 500) {
        dispatch(routerRedux.push("/exception/500"));
        return;
      }
      if (e.name >= 404 && e.name < 422) {
        dispatch(routerRedux.push("/exception/404"));
      }
    });
}
